| 主权项 |
1. A process for the preparation of Z-1,1,1,4,4,4-hexafluoro-2-butene from 2,3-dichloro-1,3-butadiene comprising the Steps of:
h) contacting chlorine with 2,3-dichloro-1,3-butadiene to obtain 1,2,2,3,3,4-hexachlorobutane; i) contacting the 1,2,2,3,3,4-hexachlorobutane with a first basic aqueous solution to produce 1,2,3,4-tetrachlorobuta-1,3-diene; j) adding chlorine to the 1,2,3,4-tetrachlorobuta-1,3-diene to obtain 1,1,2,2,3,3,4,4-octachlorabutane; k) contacting the 1,1,2,2,3,3,4,4-octachlorobutane in a second basic aqueous solution to produce 1,1,2,3,4,4-hexachlorobuta-1,3-diene. l) combining hydrogen fluoride with the 1,1,2,3,4,4-hexachlorobuta-1,3-diene to obtain E- and Z-1326mxz (1,1,1,4,4,4-hexafluoro-2-chloro-2-butene); m) reacting Z-1,1,1,4,4,4-hexafluoro-2-chloro-2-butene with an aqueous solution of an alkali metal hydroxide and an alkali metal halide to produce a mixture comprising hexafluoro-2-butyne; and, n) hydrogenating hexafluoro-2-butyne to 1,1,1,4,4,4 hexafluro-2-butene. |
